Best Includes Source SDK Games on Steam

Name Release Date Current Players All-Time Peak Rating
Half-Life 2 Half-Life 2 16 Nov, 2004 34 663 54 831 96.37
Left 4 Dead 2 Left 4 Dead 2 16 Nov, 2009 31 775 69 939 96.74
Garry's Mod Garry's Mod 29 Nov, 2006 24 797 38 330 96.04
Counter-Strike: Source Counter-Strike: Source 1 Nov, 2004 11 187 14 784 95.07
Black Mesa Black Mesa 6 Mar, 2020 2 690 4 208 93.96
Portal Portal 10 Oct, 2007 763 2 092 97.17
Half-Life 2: Deathmatch Half-Life 2: Deathmatch 1 Nov, 2004 698 1 230 88.40
Menace from the Deep Menace from the Deep 2024 682 1 518 79.18
Left 4 Dead Left 4 Dead 17 Nov, 2008 649 2 213 94.62
No More Room in Hell No More Room in Hell 31 Oct, 2013 606 2 119 88.54
Day of Defeat: Source Day of Defeat: Source 12 Jul, 2010 490 677 89.62
Alien Swarm: Reactive Drop Alien Swarm: Reactive Drop 20 Apr, 2017 211 664 92.75
Half-Life 2: Episode Two Half-Life 2: Episode Two 10 Oct, 2007 155 530 95.16
Fistful of Frags Fistful of Frags 9 May, 2014 111 206 89.62
Half-Life 2: Episode One Half-Life 2: Episode One 1 Jun, 2006 109 517 93.76
Pool Nation FX Lite Pool Nation FX Lite 7 Dec, 2015 74 308 70.06
Astro Colony Astro Colony 7 Nov, 2022 66 742 79.27
Selaco Selaco 30 May, 2024 38 1 104 89.83
Day of Infamy Day of Infamy 23 Mar, 2017 36 63 81.03
Empires Mod Empires Mod 28 Jul, 2008 29 57 81.91
Zombie Panic! Source Zombie Panic! Source 3 Oct, 2008 28 74 82.25
Battle Grounds III Battle Grounds III 30 Jun, 2019 15 162 82.89
Pirates, Vikings, and Knights II Pirates, Vikings, and Knights II 12 Feb, 2010 13 65 84.92
Hidden Through Time 2: Discovery Hidden Through Time 2: Discovery To be announced 9 44 78.03
The Liminal Universe The Liminal Universe Coming soon 8 8 61.25
BrainBread 2 BrainBread 2 9 Mar, 2022 7 25 71.52
Double Action: Boogaloo Double Action: Boogaloo 23 Oct, 2014 7 27 90.37
Kreedz Climbing Kreedz Climbing 15 Jun, 2017 4 10 78.23
Rise of the Triad Rise of the Triad 31 Jul, 2013 4 23 64.53
Absorber Absorber 9 Jul, 2023 3 70 71.15
Sunrise: survival Sunrise: survival 3 Aug, 2017 1 19 49.33
Kingdom of Atham: Crown of the Champions Kingdom of Atham: Crown of the Champions 12 Jan, 2024 1 26 73.54
The Backrooms Project The Backrooms Project To be announced 0 0
Momentum Mod Momentum Mod To be announced 0 0
ExtracTD Demo ExtracTD Demo Coming soon 0 0
Pool Nation FX - Unlock All Locations Pool Nation FX - Unlock All Locations 7 Oct, 2015 0 0
Battle For It All Battle For It All To be announced 0 0
Rap simulator Demo Rap simulator Demo Coming soon 0 0
Deluxe Content - Cossacks 3: Days of Brilliance Deluxe Content - Cossacks 3: Days of Brilliance 13 Dec, 2016 0 0 73.71
Angry Tiny Sun Angry Tiny Sun To be announced 0 0
Aperture Tag: The Paint Gun Testing Initiative Aperture Tag: The Paint Gun Testing Initiative 15 Jul, 2014 0 0 80.81
forclaz - DLC 1 0 0
Red Tower Red Tower Q1 2024 0 0
Captain Content Pack Captain Content Pack 22 Jun, 2016 0 0
Gravity Control Gravity Control Coming soon 0 0
A Long Night For Crazy King Demo A Long Night For Crazy King Demo Coming soon 0 0
Backrooms: Perpetual Backrooms: Perpetual Coming soon 0 0
Dino Hazard: Chronos Blackout Dino Hazard: Chronos Blackout 22 Dec, 2023 0 10 80.05
'83 '83 To be announced 0 0
Half-Life 2 RTX Half-Life 2 RTX Coming soon 0 0
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